youtube uploader script adjustment

I have a clipshare video sharing website. I also have a youtube uploader installed, which basically retrieves videos from youtube. The youtube uploader script works fine but I would like the rendering process slightly altered a bit. When I finish uploading a video from youtube, I would like the thumbnail (jpg) it captures to be done during the middle of the original video. This is because right now it captures the thumbnail of the original movie at the start, and the start usually is black. So all over my site, I have lots of black looking boxes instead of thumbnails with a picture. My budget for this is only $30 because this should only be a 5-10min job for an experience php programmer. Also, please back up original files as I don’t want any damage to my script. Thanks